AQA Biology A-Level - Respiration QP
Q1.
(a) Describe the process of glycolysis.
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(4)
(b) Malonate inhibits a reaction in the Krebs cycle.
Explain why malonate would decrease the uptake of oxygen in a respiring
cell.
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(2)
(Total 6 marks)
Page 1 of 16
,AQA Biology A-Level - Respiration QP
Q2.
(c) In muscles, pyruvate is converted to lactate during prolonged exercise.
Explain why converting pyruvate to lactate allows the continued production
of ATP by anaerobic respiration.
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(2)
Q3.
Yeast cells can respire aerobically or anaerobically. A student used the
apparatus shown in Figure 1 to measure the rate of respiration in yeast.
She:
• positioned the flask in a water bath so that the yeast culture reached a
constant temperature
• then left the apparatus for one hour before starting her investigation.
Figure 1
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, AQA Biology A-Level - Respiration QP
(a) Suggest one reason why it was important that the student left the
apparatus for one hour after the yeast culture reached a constant
temperature.
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(1)
(b) During her investigation, the coloured liquid moved to the right.
Explain why it moved to the right.
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(2)
(c) The student found that the coloured liquid moved 1.5 cm in 24 hours. The
diameter of the lumen (hole) of the capillary tubing was 1 mm.
The volume of a capillary tubing is given by πr2l, where π is 3.14 and l =
length.
Calculate the volume of gas produced in cm3 hour–1.
Show your working.
Answer = ____________________ cm3 hour–1
(2)
Page 3 of 16
Q1.
(a) Describe the process of glycolysis.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(4)
(b) Malonate inhibits a reaction in the Krebs cycle.
Explain why malonate would decrease the uptake of oxygen in a respiring
cell.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
(Total 6 marks)
Page 1 of 16
,AQA Biology A-Level - Respiration QP
Q2.
(c) In muscles, pyruvate is converted to lactate during prolonged exercise.
Explain why converting pyruvate to lactate allows the continued production
of ATP by anaerobic respiration.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
Q3.
Yeast cells can respire aerobically or anaerobically. A student used the
apparatus shown in Figure 1 to measure the rate of respiration in yeast.
She:
• positioned the flask in a water bath so that the yeast culture reached a
constant temperature
• then left the apparatus for one hour before starting her investigation.
Figure 1
Page 2 of 16
, AQA Biology A-Level - Respiration QP
(a) Suggest one reason why it was important that the student left the
apparatus for one hour after the yeast culture reached a constant
temperature.
___________________________________________________________
___________________________________________________________
(1)
(b) During her investigation, the coloured liquid moved to the right.
Explain why it moved to the right.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
(c) The student found that the coloured liquid moved 1.5 cm in 24 hours. The
diameter of the lumen (hole) of the capillary tubing was 1 mm.
The volume of a capillary tubing is given by πr2l, where π is 3.14 and l =
length.
Calculate the volume of gas produced in cm3 hour–1.
Show your working.
Answer = ____________________ cm3 hour–1
(2)
Page 3 of 16
